JPS63190313A - Detection of normal conduction transition in superconducting magnet - Google Patents
Detection of normal conduction transition in superconducting magnetInfo
- Publication number
- JPS63190313A JPS63190313A JP62021745A JP2174587A JPS63190313A JP S63190313 A JPS63190313 A JP S63190313A JP 62021745 A JP62021745 A JP 62021745A JP 2174587 A JP2174587 A JP 2174587A JP S63190313 A JPS63190313 A JP S63190313A
- Authority
- JP
- Japan
- Prior art keywords
- normal conduction
- magnet
- detection
- conduction transition
- optical fiber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000007704 transition Effects 0.000 title claims abstract description 26
- 238000001514 detection method Methods 0.000 title abstract description 15
- 239000013307 optical fiber Substances 0.000 claims abstract description 16
- 230000003287 optical effect Effects 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 8
- 230000000694 effects Effects 0.000 abstract description 2
- 239000000835 fiber Substances 0.000 abstract 1
- 239000002887 superconductor Substances 0.000 abstract 1
- 206010027476 Metastases Diseases 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000009401 metastasis Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/001—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for superconducting apparatus, e.g. coils, lines, machines
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
Landscapes
- Measuring Magnetic Variables (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は超電導磁石の常電導転移検出法に関する。詳し
くは、本発明は、超電導磁石の常電導転移の際の温度変
化を光学的に検出して、瞬時かつ電磁的雑音の影響を受
けることなく、転移検出が可能となるごとき超電導磁石
の常電導転移検出法に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for detecting a normal conduction transition in a superconducting magnet. Specifically, the present invention optically detects the temperature change during the normal conduction transition of the superconducting magnet, and detects the transition instantaneously without being affected by electromagnetic noise. Concerning metastasis detection methods.
（従来の技術）
超電導磁石の常電導転移とは、極低温（約４Ｋ）におい
て電気抵抗がＯで、動作中の磁石において何らかの原因
によって、その一部分の温度が（８〜２０Ｋに）上昇し
て、超電導性が消失することを言う。この場合に発生す
る電気抵抗によって磁石内に多大な熱が発生し、この熱
によって常電導領域がさらに拡大しつづけるため、放置
すると、磁石の破損を来すことになる。従って、超電導
磁石が常電導転移を起こした場合には、確実かつ速やか
にそれを検出して、磁石の電流値を下げることが必要不
可欠である。(Prior art) The normal conduction transition of a superconducting magnet is when the electrical resistance is O at an extremely low temperature (approximately 4 K), and when the temperature of a part of the magnet rises (to 8 to 20 K) due to some reason during operation. , which means that superconductivity disappears. The electrical resistance generated in this case generates a large amount of heat within the magnet, and this heat causes the normal conduction region to continue to expand further, so if left untreated, the magnet will be damaged. Therefore, when a superconducting magnet undergoes a normal conduction transition, it is essential to detect it reliably and quickly and to lower the current value of the magnet.
従来の常電導転移検出法としては、常電導が発生してい
る部分の電圧とその他の部分の電圧を比較することによ
る電気的検出が行われている。しかしながら、近年、超
電導コイルのパルス動作が可能になってきたことにより
、コイル端子電圧が従来の数Ｖ〜数十Ｖから数百Ｖ〜数
千Ｖへと上昇し、電磁的誘電ノイズも百倍以上に増大し
た。このため、従来の電気的検出法では、信号対雑音比
が大巾に低下し、信頬度の高い常電導転移検出が困難と
なっている。As a conventional normal conduction transition detection method, electrical detection is performed by comparing the voltage of a part where normal conductivity occurs and the voltage of other parts. However, in recent years, as pulse operation of superconducting coils has become possible, the coil terminal voltage has increased from the conventional several volts to several tens of volts to hundreds of volts to several thousand volts, and the electromagnetic and dielectric noise has also increased by more than 100 times. It increased to For this reason, in conventional electrical detection methods, the signal-to-noise ratio is greatly reduced, making it difficult to detect highly reliable normal conduction transitions.
（発明が解決しようとする問題点）
本発明の目的はこのような問題点のない超電導磁石の常
電導転移検出法を提供することである。(Problems to be Solved by the Invention) An object of the present invention is to provide a method for detecting the normal conduction transition of a superconducting magnet that is free from such problems.
（問題点を解決するための手段）
本願発明者は、この目的達成のため鋭意研究の結果、温
度に依存して内部の光学的伝播状態が変化する光ファイ
バーを超電導磁石中に置いて、磁石の常電導転移時にお
ける温度変化によって検出を行うことから成る超電導磁
石の常電導転移検出法を発明するに到った。(Means for Solving the Problems) In order to achieve this objective, the inventor of the present application, as a result of intensive research, placed an optical fiber whose internal optical propagation state changes depending on the temperature in a superconducting magnet. We have invented a method for detecting the normal conduction transition of superconducting magnets, which consists of detecting the temperature change during the normal conduction transition.
具体的方法としては、温度に依存して内部の光学的伝播
状態が変化する光ファイバー（以下単に「光ファイバー
１と称する）を、超電導線と共に巻線する等の手法によ
って、磁石中に設置する。Specifically, an optical fiber whose internal optical propagation state changes depending on temperature (hereinafter simply referred to as "optical fiber 1") is installed in a magnet by winding it together with a superconducting wire.
このようにして、光ファイバーの一端から検出光を入射
し、その他端から検出光を取り出して、光フアイバー中
における光学的伝播状態の変化を検出する。このように
すると、常電導転移が発生した場合、磁石中の温度変化
によって直ちに光検出器に信号の変化が現れるため、転
移検出が可能となる。In this way, detection light is input from one end of the optical fiber, and detected light is extracted from the other end to detect changes in the optical propagation state within the optical fiber. In this way, when a normal conduction transition occurs, a change in signal immediately appears on the photodetector due to a temperature change in the magnet, making it possible to detect the transition.
本発明においては、第２図に示すように、光ファイバー
を、超電導導体の外表面、又は内部に並行して設置し、
この光フアイバー中に検出用の光線を常時通しておく。In the present invention, as shown in FIG. 2, optical fibers are installed in parallel on the outer surface or inside of the superconducting conductor,
A detection light beam is passed through this optical fiber at all times.
このようにしておくと、磁石の一部に常電導転移が発生
した場合、その部分の温度上昇によって、常電導領域の
長さに応じた光フアイバー中の検出用光線の伝播状態が
直ちに変化する。従って、その変化を検出することによ
って、常電導転移の検出が可能である。この光学的伝播
状態の変化とは、透過光の干渉モートの変化、偏波面の
回転等を言う。In this way, if a normal conduction transition occurs in a part of the magnet, the temperature rise in that part will immediately change the propagation state of the detection light beam in the optical fiber according to the length of the normal conduction region. . Therefore, by detecting the change, it is possible to detect the normal conduction transition. This change in the optical propagation state refers to a change in the interference moat of transmitted light, rotation of the plane of polarization, etc.
（′作用）
本発明の方法に依れば、電磁的ノイズの影響を全く受け
ることなく、常電導転移の検出を行うことができ、また
雑音除去用の電気フィルターも使用する必要がないため
、応答速度を非常に速くすることが可能である。従って
、本発明の検出法を用いることにより、従来の方法では
常電導転移検出が困難な動作条件の下においても、高い
信頬度で動作する超電導磁石を製作することができる。('Effect) According to the method of the present invention, normal conduction transition can be detected without being affected by electromagnetic noise at all, and there is no need to use an electric filter for noise removal. It is possible to make the response speed very fast. Therefore, by using the detection method of the present invention, it is possible to manufacture a superconducting magnet that operates with high reliability even under operating conditions where it is difficult to detect normal conduction transition using conventional methods.
第１図は、一般的な超電導磁石の断面構造、及び本発明
の方法を用いた常電導転移検出系の構成を示す。
図において、１は超電導磁石、
２は光ファイバー、
３は検出光発生器、
４は光検出器、
５は検出信号処理器
である。
第２図は、第１図のＡ部の詳細図で、光ファイバーと超
電導線の接触法についての数例を示す。 ＼図におい
て、
１は光ファイバー−
２は超電導線、
３は絶縁物、
４は強制冷凍体に使用される金属外被部である。
（ジ受ｉ食冷凍型）FIG. 1 shows the cross-sectional structure of a general superconducting magnet and the configuration of a normal conduction transition detection system using the method of the present invention. In the figure, 1 is a superconducting magnet, 2 is an optical fiber, 3 is a detection light generator, 4 is a photodetector, and 5 is a detection signal processor. FIG. 2 is a detailed view of part A in FIG. 1, and shows several examples of methods of contacting optical fibers and superconducting wires. In the figure, 1 is an optical fiber, 2 is a superconducting wire, 3 is an insulator, and 4 is a metal jacket used in a forced refrigeration body. (Frozen type)
Claims (1)
イバーを超電導磁石中に置いて、磁石の常電導転移時に
おける温度変化によって検出を行うことから成る超電導
磁石の常電導転移検出法。A method for detecting the normal conduction transition of a superconducting magnet, which consists of placing an optical fiber whose internal optical propagation state changes depending on the temperature inside the superconducting magnet, and detecting the temperature change during the normal conduction transition of the magnet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62021745A JPS63190313A (en) | 1987-02-03 | 1987-02-03 | Detection of normal conduction transition in superconducting magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62021745A JPS63190313A (en) | 1987-02-03 | 1987-02-03 | Detection of normal conduction transition in superconducting magnet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63190313A true JPS63190313A (en) | 1988-08-05 |
Family
ID=12063610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62021745A Pending JPS63190313A (en) | 1987-02-03 | 1987-02-03 | Detection of normal conduction transition in superconducting magnet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63190313A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS646308A (en) * | 1987-03-05 | 1989-01-10 | Sumitomo Electric Industries | Composite cable for electricity and light transmission |
| EP0538072A2 (en) * | 1991-10-17 | 1993-04-21 | Canon Kabushiki Kaisha | Method and apparatus for detecting superconductor quench and method and apparatus for preventing superconductor quench |
| US5430814A (en) * | 1994-01-05 | 1995-07-04 | Advec Corporation | Temperature transient detection system for superconducting magnets |
| EP1583211A2 (en) * | 2004-03-30 | 2005-10-05 | General Electric Company | Superconductor quench monitoring and control system and method of operating the same |
| WO2011129245A1 (en) * | 2010-04-12 | 2011-10-20 | 株式会社フジクラ | Superconducting wire material, superconducting coil, and superconducting protective device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5940506A (en) * | 1982-08-30 | 1984-03-06 | Sumitomo Electric Ind Ltd | Detector for quenching of superconductive magnet |
-
1987
- 1987-02-03 JP JP62021745A patent/JPS63190313A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5940506A (en) * | 1982-08-30 | 1984-03-06 | Sumitomo Electric Ind Ltd | Detector for quenching of superconductive magnet |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS646308A (en) * | 1987-03-05 | 1989-01-10 | Sumitomo Electric Industries | Composite cable for electricity and light transmission |
| EP0538072A2 (en) * | 1991-10-17 | 1993-04-21 | Canon Kabushiki Kaisha | Method and apparatus for detecting superconductor quench and method and apparatus for preventing superconductor quench |
| US5430814A (en) * | 1994-01-05 | 1995-07-04 | Advec Corporation | Temperature transient detection system for superconducting magnets |
| EP1583211A2 (en) * | 2004-03-30 | 2005-10-05 | General Electric Company | Superconductor quench monitoring and control system and method of operating the same |
| JP2005287286A (en) * | 2004-03-30 | 2005-10-13 | General Electric Co <Ge> | Quenching monitor control system and operation method thereof |
| EP1583211A3 (en) * | 2004-03-30 | 2009-09-09 | General Electric Company | Superconductor quench monitoring and control system and method of operating the same |
| JP4733989B2 (en) * | 2004-03-30 | 2011-07-27 | ゼネラル・エレクトリック・カンパニイ | Kenting monitoring control system and operation method thereof |
| WO2011129245A1 (en) * | 2010-04-12 | 2011-10-20 | 株式会社フジクラ | Superconducting wire material, superconducting coil, and superconducting protective device |
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